Robert Del Naja, aka 3D of Massive Attack, played a surprise DJ set at the Extinction Rebellion protest in London yesterday. The mass demonstration has mobilized thousands of climate activists in nonviolent disruption in London, with efforts centered in Marble Arch, where Del Naja performed. Watch footage below.

Extinction Rebellion hopes to open negotiations with London mayor Sadiq Khan about next-steps for the British capital’s climate policies. Khan was criticized yesterday for urging protestors to let London return to “business as usual.” At least 1,000 protestors have so far been arrested.